Sawmill set-works.



P. I. BOGIE & M. C. ANDERSON. SAWMILL SET WORKS.

APPLICATION FILED FEB. Z6, 1906.

HATENTED DBC. 10, 190'?.-

WITNESS-.55;

A TTU/VE 1/5 1s PETER: co., wAsmNcnm. n. c.

PATBNTED DBO. 1o, 1907. P. J. BOGIE & M. G. ANDERSON.

SAW MILL SET WORKS.

APPLICATION FILED PEB. 26, 1906.

2 SHEETS-SWEET 1HE NoRRls Psrzms co., w mar UNTTED STATES PATENT orrion PATRICK J. BOGIE AND MATTHEW C. ANDERSON, OF WASHBURN, WISCONSIN.

SAWMILL SET-WORKS.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application led February 261906. Serial No. 303.028.

To all whom it may concern:

Be it known that we, PATRICK J. BOGIE and MATTHEW O. ANDERSON, citizens of the United States, residing at Washburn, in the county of Bayfield and State of Wisconsin, have invented a new and useful Sawmill Set-Vorks, of which the following is a specification.

This invention relates to steam actuated set works for saw mill carriages, and is primarily designed to simplify the means for transferring power from the steam cylinder to the rock shaft; to provide for the convenient adjustment of the power transmitting mechanism so as to gage the thickness of the boards to be cut; to enable the convenient control of the slide valve for the cylinder; and to insure one complete stroke of the piston during each actuation of the setting mechanism so as to positively return the transmitter to its starting point or position of rest which insures a uniform gage of cut.

In carrying out the aforementioned objects, it is proposed to adapt the present invention for application to any ordinary type of set mechanism which includes a rocker shaft, without making any alterations whatsoever in the set mechanism.

Vith these and other objects in view7 the present invention consists in the combination and arrangement of parts as will be hereinafter more fully described, shown in the accompanying drawing and particularly pointed out in the appended claims, it being understood that changes in the form, proportion, size and minor details may be made, within the sco e of the claims without departing from t ie spirit or sacrificing any of the advantages of the invention.

In the drawings: Figure 1 is an end view of a saw mill carriage having a conventional tyfpe of set mechanism and equipped with the motor mechanism of the present invention. Fig. 2 is an enlarged fragmentary plan view of a portion of the set mechanism and all of the present motor mechanism.

Like characters of reference designate corresponding parts in all of the figures of the drawings.

For the adequate understanding of the application and operation of the present invention, there has been shown in the accompanying drawings a conventional form of saw mill carriage including the usual timbers 1 across which extends a series of head blocks, one of which has been shown at 2 for the slidable support of an ordinary knee 3. Extending longitudinally of the carriage in rear of the knee is the usual set shaft 4 carrying a pair of ratchet wheels 5. In rear of the set shaft and in parallelism therewith, is the rocker shaft 6 having,double or reversely disposed crank arms 7 from which extend links S to the respective swinging pawl carriers 9 mounted u on the set shaft and carrying pawls 10 wor ring in conjunction with the respective ratchet wheels. When the rocker shaft 6 is" rotated, the ratchet wheels 5 will be alternately turned in the same direction so as to turn the set shaft and thereby feed the knee forward. The parts thus far described are conventional and can be varied at will, as they have been shown merely to illustrate the ap lication of the present invention.

n carrying out the present invention, there is provided an upright steam cylinder 11 which has opposite trunnions 12 disposed midway between its heads and mounted to rotate in suitable brackets 13 carried by and. projecting from the rear side of the carriage. A valve chest 14 is mounted upon the rear side of the cylinder and has a valve stem 15 connected to a bell crank lever 16 fulcrumed upon the upper head of the cylinder and in position for manual control. An arcuate crank arm 17 is suitably secured to the rock shaft 6, preferably between the cranks 7,v said arm being struck from the trunnions of the cylinder as a center and having its upper edge provided with notches 18 so as to form a rack. A slide 19 works upon the rack 17 and is connected to the upper end of a piston rod 20 by means of a wrist pin connection 21. From the top of the slide there rises a suitable handle 22 for convenience in moving the slide to any adjusted position upon the rack. The top of the slide is pierced at opposite sides of the handle by means of set screws 23 threaded through the slide and 'swiveled upon a plate 24 carrying terminal shoulders or projections 25 to enter the notches of the rack so as to hold the slide when adjusted thereon. A wedge or key 26 is driven in between the bottom of the slide and the under side of the rack so as to positively clamp the slide upon the rack and prevent looseness between these parts. In practice, the piston is normally at its outer limit and is designed to make a complete down and up movement during each setting operation. To adjust the connection between the motor and the rock shaft for any 5 predetermined thickness of board, the wedge or key 26 is driven out and the set screws 23 are loosened so as to lift the latch member out of engagement with the rack 17, Whereupon the slide may be moved to any predetermined position upon the rack, after which it is interlocked with the latter through the medium of the latch and the wedge. rlChe lever 16 is then pulled rearwardly and held until the piston moves to the lower end of the cylinder whereupon the lever is pushed back to its original position so as to reverse the movement of the piston which then travels upward to its original position. DurinOr this operation, the rack or crank arm 17 is rst moved downwardly and the rock shaft 4 is rotated through the medium of one of the dogs or pawls7 and when the crank arm is swung back to its original position, the other dog or -Ipawl becomes active. It will here be explained that as the piston makes a complete stroke and returns to its original position, the settinor movement of the knee must of necessity alnways be the same which insures a uniform thickness of the boards 30 which are cut.

Having thus described the invention, what is claimed is:

1. ln saw mill set works, a set shaft, ratchet wheels thereon, pawl carriers for each ratchet wheel, a rock shaft, crank arms on said shaft projecting therefrom in diametrically opposite directions, connections between the cranks and the pawl carriers, an arc-shaped crank arm carried by the rock shaft, an oscillating cylinder, and a pistonrod connected to the last-named crank arm.

2. In saw mill set works, the combination with a rocker shaft having double or reversely-disposed crank arms, of links pivotally connected with the crank arms, a set shaft, pawl carriers connected with the shaft and with the links, an oscillating cylinder, a

4crank arm carried by the rock shaft and struck from the pivotal support of the cylinder as a center, and a piston-rod adjustably 50 connected with the crank arm.

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses.

PATRICK J. BOGIE. MATTHEW/V C. ANDERSON` litnesses Jol-IN WALSH, E. A. WALSH. 

